Programming Jabber. Extending XML Messaging DJ Adams

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• Programming Jabber
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  • A Note Regarding Supplemental Files
  • Preface
    • The History of Jabber
      • The Pre-Jabber History
      • Scratching an Itch
      • Along Came Jabber
    • IM System Features
    • Whats Inside
    • Software Used in This Book
      • Java
      • Perl
      • Python
    • Where to Go for More Information
    • Conventions Used in This Book
    • How to Contact Us
    • Acknowledgments
  • I. Getting Started with Jabber
    • 1. Introducing Jabber
      • 1.1. Imaginary Jabber Conversation
      • 1.2. A Simple Script
    • 2. Inside Jabber
      • 2.1. XML-Based
      • 2.2. Asynchronous Nature
        • 2.2.1. Store and Forward
        • 2.2.2. Queuing
        • 2.2.3. Message Receipt
      • 2.3. Messaging
      • 2.4. Payload Carrier
      • 2.5. Request/Response
      • 2.6. Component/Service Architecture
      • 2.7. Custom Clients
      • 2.8. XML-RPC and SOAP
      • 2.9. Browsing
    • 3. Installing the Jabber Server
      • 3.1. Downloading the Jabber Server
      • 3.2. Installing the Server
        • 3.2.1. Running the Configure Server
        • 3.2.2. Running make
      • 3.3. Configuring the Jabber Server
      • 3.4. Starting and Stopping the Jabber Server
        • 3.4.1. Starting the Server
        • 3.4.2. Connecting a Client
        • 3.4.3. Stopping the Server
        • 3.4.4. jabberd Command-Line Switches
      • 3.5. Monitoring and Troubleshooting the Server
        • 3.5.1. If Your Server Doesn't Start
    • 4. Server Architecture and Configuration
      • 4.1. An Overview of the Server Architecture
        • 4.1.1. jabberd and Components
        • 4.1.2. Component Types
          • 4.1.2.1. The log components
          • 4.1.2.2. The xdb components
          • 4.1.2.3. The service components
          • 4.1.2.4. Delivery trees
        • 4.1.3. Component Connection Methods
          • 4.1.3.1. Library load
          • 4.1.3.2. TCP sockets
          • 4.1.3.3. Standard I/O (STDIO)
      • 4.2. Server Configuration
        • 4.2.1. Component Instances
        • 4.2.2. A Typical Component Instance Description
          • 4.2.2.1. Component type
          • 4.2.2.2. Identification
          • 4.2.2.3. Host filter
          • 4.2.2.4. The <host/> tag
          • 4.2.2.5. Component connection method
          • 4.2.2.6. Custom configuration
      • 4.3. A Tour of jabber.xml
      • 4.4. Component Instance: sessions
        • 4.4.1. Component Type and Identification
        • 4.4.2. Host Filter
        • 4.4.3. Custom Configuration
          • 4.4.3.1. Filter service
          • 4.4.3.2. Server vCard
          • 4.4.3.3. Registration instructions
          • 4.4.3.4. Welcome message
          • 4.4.3.5. Administration
          • 4.4.3.6. Update info request
          • 4.4.3.7. Autoupdate of JUD
          • 4.4.3.8. Browsable service information
        • 4.4.4. Component Connection Method
      • 4.5. Component Instance: xdb
        • 4.5.1. Component Type and Identification
        • 4.5.2. Host Filter
        • 4.5.3. Custom Configuration
        • 4.5.4. Component Connection Method
      • 4.6. Component Instance: c2s
        • 4.6.1. Component Type and Identification
        • 4.6.2. Host Filter
        • 4.6.3. Custom Configuration
        • 4.6.4. Component Connection Method
      • 4.7. Logging Definition: elogger
        • 4.7.1. Component Type and Identification
        • 4.7.2. Host Filter
        • 4.7.3. Custom Configuration
      • 4.8. Logging Definition: rlogger
        • 4.8.1. Component Type and Identification
        • 4.8.2. Host Filter
        • 4.8.3. Custom Configuration
      • 4.9. Component Instance: dnsrv
        • 4.9.1. Component Type and Identification
        • 4.9.2. Host Filter
        • 4.9.3. Custom Configuration
        • 4.9.4. Component Connection Method
      • 4.10. Component Instance: conf
        • 4.10.1. Component Type and Identification
        • 4.10.2. Host Filter
        • 4.10.3. Custom Configuration
        • 4.10.4. Component Connection Method
      • 4.11. Component Instance: jud
        • 4.11.1. Component Type and Identification
        • 4.11.2. Host Filter
        • 4.11.3. Custom Configuration
        • 4.11.4. Component Connection Method
      • 4.12. Component Instance: s2s
        • 4.12.1. Component Type and Identification
        • 4.12.2. Host Filter
        • 4.12.3. Custom Configuration
        • 4.12.4. Component Connection Method
      • 4.13. The io Section
        • 4.13.1. The <rate/> Tag
        • 4.13.2. The <karma/> Tag
        • 4.13.3. The <ssl/> Tag
        • 4.13.4. The <allow/> and <deny/> Tags
      • 4.14. pidfile Section
      • 4.15. Managing the Configuration
        • 4.15.1. The <jabberd:cmdline/> Tag
      • 4.16. Server Constellations
        • 4.16.1. Multiple Servers on One Host
        • 4.16.2. "Real" Virtual Jabber Servers
          • 4.16.2.1. Configuration for a-domain.com
          • 4.16.2.2. Configuration for b-domain.com
        • 4.16.3. Splitting Up Jabber Server Processes
          • 4.16.3.1. Define the configuration for the satellite server
          • 4.16.3.2. Open a connection point in the main server
          • 4.16.3.3. List the service definition in <browse/>
          • 4.16.3.4. Add a connector mechanism to the satellite server
          • 4.16.3.5. Specify a different PID file location
          • 4.16.3.6. Starting the main server
          • 4.16.3.7. Starting the satellite server
        • 4.16.4. Using Services on Other Jabber Servers
  • II. Putting Jabber's Concepts to Work
    • 5. Jabber Technology Basics
      • 5.1. Jabber Identifiers
        • 5.1.1. Rules and Regulations
      • 5.2. Resources and Priorities
      • 5.3. XML Streams
        • 5.3.1. The Conversation as XML Documents
        • 5.3.2. The Opening Tag
        • 5.3.3. The Response
          • 5.3.3.1. The from attribute
          • 5.3.3.2. The id attribute
        • 5.3.4. The Simplest Jabber Client
      • 5.4. Jabber's Building Blocks
        • 5.4.1. The Message Element
          • 5.4.1.1. Message attributes
            • • type
              • from
              • to
            • • id
          • 5.4.1.2. Message subelements
            • subject
            • body
            • error
            • html
            • thread
            • x
        • 5.4.2. The Presence Element
          • 5.4.2.1. Presence attributes
            • type
            • from
            • to
            • id
          • 5.4.2.2. Presence subelements
            • • show
            • • status
              • priority
              • x
          • 5.4.2.3. Presence subscription
          • 5.4.2.4. Availability Tracker
        • 5.4.3. The IQ Element
          • 5.4.3.1. IQ attributes
            • type
            • from
            • to
            • id
          • 5.4.3.2. IQ subelements
            • query
            • error
    • 6. Jabber Namespaces
      • 6.1. Namespace Usage
      • 6.2. The IQ Namespaces
        • 6.2.1. jabber:iq:agent
        • 6.2.2. jabber:iq:agents
        • 6.2.3. jabber:iq:auth
        • 6.2.4. jabber:iq:autoupdate
        • 6.2.5. jabber:iq:browse
          • 6.2.5.1. Descending the browse hierarchy from an LDAP reflector
        • 6.2.6. jabber:iq:conference
          • 6.2.6.1. The jabber:iq:conference namespace at work
        • 6.2.7. jabber:iq:gateway
          • 6.2.7.1. Discovering and using the AIM Transport's jabber:iq:gateway utility
        • 6.2.8. jabber:iq:last
        • 6.2.9. jabber:iq:oob
        • 6.2.10. jabber:iq:private
          • 6.2.10.1. Storing public data
        • 6.2.11. jabber:iq:register
          • 6.2.11.1. The <key/> tag
        • 6.2.12. jabber:iq:roster
        • 6.2.13. jabber:iq:search
        • 6.2.14. jabber:iq:time
          • 6.2.14.1. Specifying clients as query targets
        • 6.2.15. jabber:iq:version
      • 6.3. The X Namespaces
        • 6.3.1. jabber:x:autoupdate
        • 6.3.2. jabber:x:conference
        • 6.3.3. jabber:x:delay
        • 6.3.4. jabber:x:encrypted
        • 6.3.5. jabber:x:envelope
        • 6.3.6. jabber:x:event
        • 6.3.7. jabber:x:expire
        • 6.3.8. jabber:x:oob
        • 6.3.9. jabber:x:roster
        • 6.3.10. jabber:x:signed
      • 6.4. The X::IQ Relationship
      • 6.5. Miscellaneous Namespaces
        • 6.5.1. The vcard-temp Namespace
        • 6.5.2. The XHTML Namespace
    • 7. User Registration and Authorization
      • 7.1. XML Stream Flow
      • 7.2. User Registration
        • 7.2.1. Configuration and Module Load Directives
        • 7.2.2. Step by Step
          • 7.2.2.1. The XML stream header exchange
          • 7.2.2.2. "Required" fields
          • 7.2.2.3. Set without get
          • 7.2.2.4. Still no connection
          • 7.2.2.5. Passwords
          • 7.2.2.6. Reversing a user registration
          • 7.2.2.7. A note on error messages
      • 7.3. User Authentication
        • 7.3.1. Configuration and Module Load Directives
          • 7.3.1.1. Plaintext authentication method
          • 7.3.1.2. Digest authentication method
          • 7.3.1.3. Zero-knowledge authentication method
        • 7.3.2. Choosing the Authentication Method
        • 7.3.3. Password Errors and Retries
      • 7.4. User Registration Script
        • 7.4.1. Using the Script
    • 8. Using Messages and Presence
      • 8.1. CVS Notification via Jabber
        • 8.1.1. CVS Watches and Notification
          • 8.1.1.1. CVS commands
          • 8.1.1.2. CVS administrative files
          • 8.1.1.3. The notification
        • 8.1.2. CVS Notifications via Jabber
        • 8.1.3. The cvsmsg Script
      • 8.2. Dialup System Watch
        • 8.2.1. Making Preparations for Execution
          • 8.2.1.1. Presence
          • 8.2.1.2. Starting and stopping the script
        • 8.2.2. The HostAlive Script
        • 8.2.3. Step by Step
      • 8.3. Presence-Sensitive CVS Notification
        • 8.3.1. Subscription Relationships
        • 8.3.2. The cvsmsg-s Script
        • 8.3.3. Taking the cvsmsg-s Script Step by Step
          • 8.3.3.1. Presence callback
          • 8.3.3.2. Connection and authentication
          • 8.3.3.3. Registration of <presence/> handler
          • 8.3.3.4. Request for roster
          • 8.3.3.5. Sending of availability information
          • 8.3.3.6. Waiting for packets
          • 8.3.3.7. Finishing up
        • 8.3.4. Jabber Programming and Callbacks
    • 9. Groupchat, Components, and Event Models
      • 9.1. Keyword Assistant
        • 9.1.1. Conferencing
        • 9.1.2. The Script's Scope
        • 9.1.3. The keyassist Script
        • 9.1.4. Dissecting the keyassist Script
          • 9.1.4.1. Maintaining the keyword dictionary
          • 9.1.4.2. Message callback
          • 9.1.4.3. Presence callback
          • 9.1.4.4. The main script
          • 9.1.4.5. The processing loop
      • 9.2. Connecting Devices to Jabber
        • 9.2.1. What We're Going to Do
        • 9.2.2. The Coffee Script
        • 9.2.3. Examining the Coffee Script Step by Step
          • 9.2.3.1. Declaring the modules, constants, and variables
          • 9.2.3.2. Initialization and calibration
          • 9.2.3.3. Connecting to the Jabber server
          • 9.2.3.4. Sensor poll/presence push loop
          • 9.2.3.5. The setup_Jabber() function
          • 9.2.3.6. The set_presence() function
          • 9.2.3.7. The InPresence() subroutine
          • 9.2.3.8. The setup_RCX() function
          • 9.2.3.9. The calibrate() function
          • 9.2.3.10. The set_status() function
      • 9.3. An RSS News Agent
        • 9.3.1. Writing the News Agent
          • 9.3.1.1. The newsagent script as a component
          • 9.3.1.2. Working out who gets what newsfeeds
          • 9.3.1.3. Polling the RSS sources
        • 9.3.2. Other Differences Between Client and Component Programming
        • 9.3.3. The RSS News Agent Script
        • 9.3.4. Reviewing the RSS News Agent Script Step by Step
          • 9.3.4.1. Module declarations and variable definitions
          • 9.3.4.2. Connecting to the Jabber server
          • 9.3.4.3. Preparing the RSS event function and element handlers
          • 9.3.4.4. Authenticating handshake and launch of main loop
          • 9.3.4.5. Handling registration requests
          • 9.3.4.6. Handling version requests
          • 9.3.4.7. Handling browse requests
          • 9.3.4.8. Dealing with other requests
          • 9.3.4.9. The RSS mechanism
          • 9.3.4.10. The cleanup() function
          • 9.3.4.11. Helper functions
        • 9.3.5. Further Ideas
      • 9.4. A Simple Headline Viewer
        • 9.4.1. What the Headline Viewer Is Going to Do
        • 9.4.2. The hlv Script
        • 9.4.3. Reviewing the hlv Script Step by Step
    • 10. Pointers for Further Development
      • 10.1. A Simple Jabber-Based Address Book
        • 10.1.1. Using the JUD and vCards
        • 10.1.2. What Demo::JBook Will Do
          • 10.1.2.1. Searching a JUD
          • 10.1.2.2. Retrieving vCard information
        • 10.1.3. Using Demo::JBook as an Apache Handler
        • 10.1.4. The Demo::JBook Script
        • 10.1.5. Taking Demo::JBook Step by Step
          • 10.1.5.1. Declarations
          • 10.1.5.2. General handler preparation
          • 10.1.5.3. State 1: Build the JUD query form
          • 10.1.5.4. State 2: Query the JUD
          • 10.1.5.5. State 3: Retrieve a vCard
          • 10.1.5.6. General handler close
        • 10.1.6. Notes for Improvement
      • 10.2. XML-RPC over Jabber
        • 10.2.1. Jabber-RPC
        • 10.2.2. Building a Requester and a Responder
          • 10.2.2.1. The responder: JabberRPCResponder
          • 10.2.2.2. The requester: JabberRPCRequester
        • 10.2.3. JabberRPCResponder
          • 10.2.3.1. The RPCHandler class
          • 10.2.3.2. The IQRPC classes
          • 10.2.3.3. The JabberRPCResponder script
        • 10.2.4. Looking at JabberRPCResponder Step by Step
        • 10.2.5. JabberRPCRequester
        • 10.2.6. Looking at JabberRPCRequester Step by Step
        • 10.2.7. Jabber-RPC in Perl
      • 10.3. Browsing LDAP
        • 10.3.1. Building the Reflector
          • 10.3.1.1. Identifying ldapr in the browsing hierarchy
          • 10.3.1.2. Navigating into the LDAP hierarchy
          • 10.3.1.3. What the reflector is actually doing
        • 10.3.2. The ldapr script
        • 10.3.3. Looking at ldapr Step by Step
          • 10.3.3.1. Performing the actual reflection
          • 10.3.3.2. Supporting functions
      • 10.4. Building an ERP Connection
        • 10.4.1. Building an Order Approval Notification Mechanism
          • 10.4.1.1. Getting the notification out of R/3
        • 10.4.2. The approv Script
        • 10.4.3. Taking This Further
  • A. The jabber.xml Contents
  • B. The IQRPC Classes for JabberRPCResponder
    • B.1. The IQRPC Class
    • B.2. The IQRPCBuilder Class
  • About the Author
  • Colophon
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